Tipping suction device for sheet separating machines



G. SPIESS 'Aug. 27, 1935.

TIPPING SUCTION DEVICE FOR SHEET SEPARATING MACHiNES Filed July 16, 1934 2 Sheets-Sheet 1 Juan/ar- Alfarne Aug. 27, 1935. G, PIE v 2,012,485

TIPPING SUCTION DEVICE FOR SHEET SEPARATING MACHINES Filed July 16, 1934 2 Shegats-Sheet 2 Patented Au 27, i935 TEPPING SUCTION DEVICE FUR SHEET SEPARATHNG MACHHNES Georg Spiess, Leipzig, Germany Application .liuly 16, 1934, Serial No. 735,525

In Germany .iune 65, 11933 4 Claims.

The present invention relates to a tipping suction device for sheet separating machines, wherein the tipping movement of the suction member is automatically effected by the vacuum which is produced in the suction conduit which is closed by the sheet when the latter is drawn off by the suction. In one known tipping suction device of this kind, the suction nozzle member is pivotally connected in the customary manner with its support and with the suction conduit, and its tipping movement is efiected by the displacement of a rectilineally guided piston, the cylinder of which is connected to a suction conduiuin this known device the suction cylinder is, however, not directly insertedin the suction conduit, but is connected with the conduit leading to the nozzle by means of a branch conduit. As a result of this the operation of the device is unfavorably affected, i. e. its sensitiveness is diminished, inasmuch as the piston does not react immediately upon the sucking-up of the sheet.

It is a particular object of the present invention to provide means whereby whilst retaining the aforesaid advantageous form of cylinder for the device, the same favourable working conditions are also provided such as are obtained in tipping suction devices in which the suction nozzle member forms an integral part of the said .device. According to the invention this result is attained by the provision of a device wherein the cylinder and piston are inserted in or associated with the suction conduit leading to the nozzle as parts of the latter and the hollow piston rod is connected by means of a tubular link with the suction nozzle, member, whilst the cylinder is mounted so as to be capable of tipping.

Furthermore, a simplification of the tipping movement of the suction member, as compared with the known arrangement, is obtained by the rectilineal guiding of the piston.

As the tipping axis of the suction device pivoted on its support cannot be located exactly in the plane of the uppermost sheet but must be located above the plane of the sheet at least at a distance therefrom which is equal to the radius of the cylindrical portion of the hinge, the resultis that when the edge of the sheet which is held by the suction members is bent over, a small forwardly directed tension arises in the sheet, which l a detachment of the sucked-up edge of the sheet from the suction members. Such displacement (Cl. Wit-2'?) or detachment then operates to an increasing and, detrimental extent. In the sheetsupporting devices it is knownto separate the uppermost sheet from the pile in such manner that at least during the tipping-up a displacement of E5 the sheet on the pile cannot take place, by the provision of means whereby the suction member during the tipping operation is enabled to execute a compensating backward movement.

According to the present invention, the compensating movement of the tipping suction device is eiiected without movement of the suction device, by the utilization of the slight tipping movement of the cylinder which is a particular feature of the previously specified construction, the suction member not being pivoted on the support of the hollow suction device, but an intermediate lever pivoted to the support, to which intermediate lever a swinging movement efiectingthe backward movement of the suction member is imparted by means of the slight swinging movement of the cylinder resulting from the tipping of the suction member. The suction cylinder is for this purpose provided with cam members which act upon the intermediate lever so as to cause a slight turning movement.

Two preferred constructional forms of a suction device according to the invention are illustrated in the accompanying drawings in which:

Figures 1 to 3 show a tipping suction device without compensating movement.

Fig. 1 is an elevation of the device showing the position of the parts before the suction operation.

Fig. 2 is an elevation showing the position of the parts after the suction operation.

Fig. 3 isa plan corresponding to Figure 1.

Figs. 4 to 6 show a tipping suction device having compensating movement of the suction memhere.

Fig. 4 is an elevation of the last named device with the parts in the position which they occupy before the suction operation.

Fig. 5 is an elevation showing the parts in the position which they occupy after the suction operation, and

Fig. 6 is a plan corresponding to Fig. 4.

On the sheet pile i the suction members 3 bear with their suction surfaces 2 during the sucking up on the uppermost pile sheet, and when the sheet surface strikes against the suction surface 2 an under pressure (vacuum) corresponding to the suction of the air pump is produced at the same moment in the hollow space of the suction members 3. The suction members 3 are provided at their rear parts with swinging journals A which are pivotally mounted so as to be rotatable around the arm ii of the supporting pin 6 which moves up and down. In the second arm 5 of the supporting member 5 the cylinder 9 is mounted by means of the hinge lever 8 so as to be capable of swinging, so that the cylinder 9 can, when a tipping movement of the suction member 3 takes place, turn as desired around the pivot pin id. The cylinder is provided with a lateral pipe connection or union H for the suction air conduit. In the hollow space of the cylinder 9 the piston i2 is slidably mounted, the latter being pivotally connected by means of its tubular and hollow piston rod i3 with the connecting pipe id of the suction members 3, so as to be likewise rotatable. By means of the connecting pipe Hi and the hollow piston rod i3, the hollow space of the valve 9 is in direct connection with the-vacuum space, of the suction member 3, and consequently also with that of the whole feeding device.

As soon as the suction members 3 descend on to the uppermost pile sheet of the sheet pile i and their suction surfaces 2 have come into immediate proximity to the sheet to be sucked up, the latter is drawn rapidly upwards on to the suction surfaces and closes their suction openings. A corresponding vacuum immediately arises as the result of the sudden impact, the lateral displacement of the piston l2 takes place and the suction members 3 are swung around their fixed point, viz. the hinge bearing t. The sheet which has been drawn up by suction action is meanwhile, since the hinge bearing is located close above the plane of the particular sheet which is to be drawn up, tipped up to an obtuse angle and is separated with certainty from the next succeeding sheet lying below it.

After the tipping up of the sheet the suction member connection is lifted vertically away from the pile in known manner in order to ensure with certainty that the blast air current from the blowers arranged behind the sheet pile, can complete the further loosening of the drawn-up sheet from the next succeeding one.

In the second constructional example (Figs. 4 to 6) the suction members 3 are rotatably mounted in journals provided at the ends of two-armed intermediate levers i5, which are pivoted by means of pins 16 on the ends of the limbs ll of an angular forked bearing member.

The two intermediate levers H are provided with stop rollers I 8 which bear under the tension of a spring IS on cams 2!] arranged laterally on the cylinder 9. At the other ends of the two angular bearing limbs I! which form a bearing member, the suction cylinder member 9 is pivotally mounted by means of pins N in such manner as to be capable of swinging."

The device operates in the following manner:-

When the suction surfaces of the suction members 3 strike on the surface of the sheet the latter is immediately drawn up by suction and in consequence of the rarefaction of the air in the cylinder 9 the piston i2 is simultaneously displaced.

2,01a4se This movement of the piston I2 together with the piston rod 13 causes a tipping movement of the suction members 3 connected by means of the conduit It around their pivot pins which are fixed to the intermediate levers l5. When the tipping movement occurs the connecting conduit moves slightly upwards and causes a slight tipping movement or the cylinder 9 together with its earns 20. In consequence of this the intermediate levers l5 are swung around their bearing pins id, in such manner, that the end journals to which the suction members 3 are pivoted are carried back slightly. This backward movement compensates the slight forward movement of the sheet, which results from the fact that the tipping axis of the suction member is not located exactly in the plane of the sheet. A stop adjusting screw 28 renders it possible to regulate the stroke of the piston.

I claim:-

1. A tipping device for sheet separating machines in which the tipping movement of the nozzle member which is pivotally' connected to its support and to the suction conduit is effected by the vacuum in the suction conduit which is closed by the sheet, by means of a suction device consisting-of a cylinder and a piston, characterized in that the cylinder of the piston of the suction device is inserted as a conduit member in the suction conduit leading to the nozzle, and the.

piston of the suction device is connected with the nozzle member by means of a tubular link member, whilst the cylinder of the suction device which is connected. to the conduit is mounted on the support of the tipping suction device so as to be capable of swinging. a 2. Tipping suction device according to claim 1, characterized in that the piston of the suction device is connected with a conduit which connects the hollow spaces of several suction members pivoted to the support.

3. Tripping suction device according to claim 1, characterized in that the suction member is pivoted to an intermediate lever which is itself pivoted to the support and which is caused by theswinging movement of the suction member to execute a swinging movement effecting a back.- ward movement of the suction member.

4. Tipping suction device according to claim 1 characterized in that the suction member is pivoted to an intermediate lever which is itself pivoted to the support and which is caused by the swinging movement of thesuction member to execute a swinging movement effecting a backward movement of the suction member; said device being further characterized in that the swinging movement of the intermediate lever is brought about by the swinging movement of thesuction cylinder occurring as a result of the tipping of the suction member, through the medium of a cam which is arranged on the cylinder and on which the intermediate lever bears under the action of a spring.

GEORG SPIESS. 

